I have been using my for 2 weeks and returned it for full refund. Why ? Because it makes no point to have all that great features in a device that can't survive a day without charging. In this case I prefer to stick with a real phone that will last more than a week + dedicated internet tablet, like my 1 year old N810 (or something new, there are so many of them in the market). That was the main reason why I returned it. Some minor ones:

- Device definitely too fat and heavy.
- The stand is a joke (Nokia, use proved solutions from N810).
- The screen less bright and less responsive than in N810 (and its smaller, but it is my personal preference to keep it over 4") - again, Nokia, use proved solutions from N810.
- Slider - much worse mechanism than for example in my SE W910i, it moves so easily in the trousers pockets.
- Hardware buttons are in my opinion upside down - lock should be swapped with headphone jack.
- Keyboard, again, Nokia, use proved solutions from N810... keyboard should be bigger, why only 3 rows instead of 4 ? Only the way how the key press is better now.
- Stylus - should be on the top, not on the bottom. Again, like in N810.

I am not going to write about all the advantages of N900 as you guys covered all of them many times Maemo 5 is the best mobile operating system in the market in my opinion, but put it together with all electronics in N810 case and increase battery life at least 3 times - then I will buy it. Probably as N910